STCS1A datasheet(13/19 Pages) STMICROELECTRONICS

13 / 19 page

STCS1A

Application information

13/19

– LEDs current: 500 mA;

– Package: DFN8 3x3 mm;

–TA = 50°C;

In this case VDRAIN = 12 - 3 x 3.6 = 1.2 V

PD = (1.2 - 0.1) x 0.5 + 12 x 0.5 x 10

-3 = 0.55 + 6 x 10-3 = 556 mW

The junction temperature will be:

TJ = 37.6 x 0.556 + 50 = 70.9 °C

The following pictures show the maximum power dissipation according to the ambient

temperature for both packages:

Figure 16.

Maximum power dissipation vs TA

for DFN8 3x3 mm

Figure 17.

Maximum power dissipation vs TA

for PowerSO-8

thJA = 38 [°C/W]

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

105

115

125

[°C]

DMAX = (TJMAX-TA)/RthJA

thJA = 38 [°C/W]

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

105

115

125

[°C]

DMAX = (TJMAX-TA)/RthJA

0.00

0.50

1.00

1.50

2.00

2.50

3.00

105

115

125

[°C]

DMAX = (TJMAX-TA)/RthJA

thJA = 45 [°C/W]

0.00

0.50

1.00

1.50

2.00

2.50

3.00

105

115

125

[°C]

DMAX = (TJMAX-TA)/RthJA

thJA = 45 [°C/W]

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